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Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
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Tested in GNS3 lab Network Next Hop Metric LocPrf Weight Path *>i209.165.201.0/27 172.24.109.2 0 100 0 200 500 i * 209.165.200.230 1 0 300 500 i
Option A, setting the MED to 1 on PE2 toward BR2 outbound, wouldn’t be as effective because the MED (Multi-Exit Discriminator) attribute is used to influence the path selection between different autonomous systems (AS) when multiple paths exist. However, MED is only considered when comparing routes from the same AS. In this scenario, since BR2 is choosing between paths through different ASes (AS200 and AS300), the MED attribute won’t have the desired impact on BR2’s path selection. The weight attribute, on the other hand, is a Cisco-specific attribute that is considered first in the BGP path selection process and is local to the router on which it is set. By setting the weight to 65,535 on BR1, you ensure that BR1’s path is preferred over any other paths, effectively directing BR2 to route traffic through BR1.
Option A would continue to prefer BR2>PE2. The lower the MED, the better.